Ultra-sharp magnetization steps in perovskite manganites

Details Ultra-sharp magnetization steps in perovskite manganites Ultra-sharp magnetization steps in perovskite manganites

2002-11-15

arxiv.org/abs/cond-mat/0211337v1

Physics

Condensed Matter

Materials Science

17pages,4 figures. accepted in Phy. Rev. Lett

Scientific paper

10.1103/PhysRevLett.89.286602

We report a detailed study of step-like metamagnetic transitions in the magnetization and resistivity of polycrystalline Pr0.5Ca0.5Mn0.95Co0.05O3. The steps have a sudden onset below a critical temperature, are extremely sharp (width < 0.2 mT), and occur at critical fields which are linearly dependent on the absolute value of the cooling field in which the sample is prepared. Similar transitions are also observed at low temperature in non-Co doped manganites, including single crystal samples. These data show that the steps are an intrinsic property, qualitatively different from either previously observed higher temperature metamagnetic transitions in the manganites or metamagnetic transitions observed in other materials.

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